Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureus
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFU |
Texto Completo: | https://repositorio.ufu.br/handle/123456789/14199 |
Resumo: | The photodegradation or photocatalysis is a process of chemical degradation of matter through its decay into other elements molecularly simpler and harmless to humans and the environment. The process of when an inorganic semiconductor such as TiO2, is irradiated with ultraviolet light (wavelength 320 and 400 nm). The absorbed energy causes electronic excitation, causing electrons to peel off the outermost atomic orbitals of the semiconductor. These electrons detached in contact with the water and the O2 form oxidizing and reducing regions. Various tarnishes, organic and inorganic, in contact with these regions degrade electronics, dissociating into substances simpler and less offensive, like CO2 and H2O. Researchers from various countries studying composites based TiO2 coating surfaces as diverse as roads, window glazing and surgical scalpels. The photocatalysis is quite an interesting process, and environmentally, for inactivation of resistant nosocomial pathogens, such as fungi and bacteria, since it eliminates the use of chemical antiseptics. Studied in this work, the potential of photocatalysis of a composite base TiO2 encapsulated in epoxy resin, the degradation of Staphylococcus aureus and Escherichia coli, pathogens with high hospital infection, with a view to its application in construction, as floor coverings, walls, ceilings and furniture hospital facilities. The experiments were those with only manufacturing of tablets and lozenges epoxy resin with the composite at various concentrations of TiO2 and/or glass powder. The pads were contaminated with bacteria broth and exposed to sunlight and ambient light (solar indirect and fluorescent lamp) for certain periods. The pellets were washed in sterile saline. Part of this solution was transferred to plates containing Mueller Hinton Agar and incubated for 48 hours. After this time visual count was made of the number of CFUs in the board. The obtained results, mainly at ambient light, indicate the potential ability of the composite fotodegradante. |
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Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureusStudy of photodegradation capacity of a TiO₂-based coating facing the bacterium Staphylococcus aureusRevestimento autolimpanteFotocatáliseFotodegradaçãoTiO₂Staphylococcus aureusEscherichia coliSelf-cleaning coatingPhotocatalysisPhotodegradationCNPQ::ENGENHARIAS::ENGENHARIA CIVILThe photodegradation or photocatalysis is a process of chemical degradation of matter through its decay into other elements molecularly simpler and harmless to humans and the environment. The process of when an inorganic semiconductor such as TiO2, is irradiated with ultraviolet light (wavelength 320 and 400 nm). The absorbed energy causes electronic excitation, causing electrons to peel off the outermost atomic orbitals of the semiconductor. These electrons detached in contact with the water and the O2 form oxidizing and reducing regions. Various tarnishes, organic and inorganic, in contact with these regions degrade electronics, dissociating into substances simpler and less offensive, like CO2 and H2O. Researchers from various countries studying composites based TiO2 coating surfaces as diverse as roads, window glazing and surgical scalpels. The photocatalysis is quite an interesting process, and environmentally, for inactivation of resistant nosocomial pathogens, such as fungi and bacteria, since it eliminates the use of chemical antiseptics. Studied in this work, the potential of photocatalysis of a composite base TiO2 encapsulated in epoxy resin, the degradation of Staphylococcus aureus and Escherichia coli, pathogens with high hospital infection, with a view to its application in construction, as floor coverings, walls, ceilings and furniture hospital facilities. The experiments were those with only manufacturing of tablets and lozenges epoxy resin with the composite at various concentrations of TiO2 and/or glass powder. The pads were contaminated with bacteria broth and exposed to sunlight and ambient light (solar indirect and fluorescent lamp) for certain periods. The pellets were washed in sterile saline. Part of this solution was transferred to plates containing Mueller Hinton Agar and incubated for 48 hours. After this time visual count was made of the number of CFUs in the board. The obtained results, mainly at ambient light, indicate the potential ability of the composite fotodegradante.Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorMestre em Engenharia CivilA fotodegradação ou fotocatálise é um processo químico de degradação de matéria através da sua decomposição em outros elementos molecularmente mais simples e inofensivos ao ser humano e ao ambiente. O processo se da quando um semicondutor inorgânico como o TiO₂, é irradiado com luz ultravioleta (comprimento de onda de 320 a 400 nm). A energia absorvida provoca excitação eletrônica, fazendo com que elétrons se desprendam dos orbitais atômicos mais externos do semicondutor. Esses elétrons desprendidos, em contato com a água e com o O2, formam regiões oxidantes e redutoras. Sujidades diversas, orgânicas e inorgânicas, em contato com essas regiões, sofrem degradação eletrônica, dissociando em substancias mais simples e menos ofensivas, como CO2 e H2O. Pesquisadores de diversos países estudam compósitos a base de TiO₂ revestindo superfícies tão diversas quanto rodovias, vidros de janelas e bisturis cirúrgicos. A fotocatálise é um processo bastante interessante, e ambientalmente correto, para inativação de patógenos hospitalares resistentes, como fungos e bactérias, pois dispensa a utilização de antissépticos químicos. Estudou-se neste trabalho, o potencial de fotocatálise de um compósito a base de TiO₂ encapsulado em resina epóxi, na degradação da Staphylococcus aureus e da Escherichia coli, patógenos com alto grau de contaminação hospitalar, com vistas à sua aplicação na construção civil, como revestimento de pisos, paredes, tetos e mobiliários de instalações hospitalares. Os experimentos se deram com a fabricação de pastilhas somente com resina epóxi e pastilhas com o compósito, em diversas concentrações de TiO2 e/ou pó de vidro. As pastilhas foram contaminadas com caldo de bactéria e expostas à luz solar e à luz ambiente (solar indireta e lâmpada fluorescente), por determinados períodos. As pastilhas foram lavadas em solução salina estéril. Parte dessa solução foi transferida para placa contendo Mueller Hinton Agar e encubadas por 48 horas. Após esse tempo foi feita a contagem visual do número de UFCs presentes na placa. Os resultados obtidos, principalmente na luz ambiente, indicam potencial capacidade fotodegradante do compósito.Universidade Federal de UberlândiaBRPrograma de Pós-graduação em Engenharia CivilEngenhariasUFUDias, João Fernandohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4780737E3Melo, Geraldo Batista dehttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4777568Y7Rossignolo, João Adrianohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4796386U3Martins, José Anceloann Lago Grande2016-06-22T18:37:27Z2014-06-032016-06-22T18:37:27Z2013-11-04info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfapplication/pdfMARTINS, José Anceloann Lago Grande. Study of photodegradation capacity of a TiO₂-based coating facing the bacterium Staphylococcus aureus. 2013. 80 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Uberlândia, Uberlândia, 2013.https://repositorio.ufu.br/handle/123456789/14199porinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFUinstname:Universidade Federal de Uberlândia (UFU)instacron:UFU2017-06-27T13:53:58Zoai:repositorio.ufu.br:123456789/14199Repositório InstitucionalONGhttp://repositorio.ufu.br/oai/requestdiinf@dirbi.ufu.bropendoar:2017-06-27T13:53:58Repositório Institucional da UFU - Universidade Federal de Uberlândia (UFU)false |
dc.title.none.fl_str_mv |
Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureus Study of photodegradation capacity of a TiO₂-based coating facing the bacterium Staphylococcus aureus |
title |
Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureus |
spellingShingle |
Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureus Martins, José Anceloann Lago Grande Revestimento autolimpante Fotocatálise Fotodegradação TiO₂ Staphylococcus aureus Escherichia coli Self-cleaning coating Photocatalysis Photodegradation CNPQ::ENGENHARIAS::ENGENHARIA CIVIL |
title_short |
Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureus |
title_full |
Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureus |
title_fullStr |
Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureus |
title_full_unstemmed |
Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureus |
title_sort |
Estudo da capacidade fotodegradante de um compósito à base de TiO2 frente à bactéria Staphylococcus aureus |
author |
Martins, José Anceloann Lago Grande |
author_facet |
Martins, José Anceloann Lago Grande |
author_role |
author |
dc.contributor.none.fl_str_mv |
Dias, João Fernando http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4780737E3 Melo, Geraldo Batista de http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4777568Y7 Rossignolo, João Adriano http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4796386U3 |
dc.contributor.author.fl_str_mv |
Martins, José Anceloann Lago Grande |
dc.subject.por.fl_str_mv |
Revestimento autolimpante Fotocatálise Fotodegradação TiO₂ Staphylococcus aureus Escherichia coli Self-cleaning coating Photocatalysis Photodegradation CNPQ::ENGENHARIAS::ENGENHARIA CIVIL |
topic |
Revestimento autolimpante Fotocatálise Fotodegradação TiO₂ Staphylococcus aureus Escherichia coli Self-cleaning coating Photocatalysis Photodegradation CNPQ::ENGENHARIAS::ENGENHARIA CIVIL |
description |
The photodegradation or photocatalysis is a process of chemical degradation of matter through its decay into other elements molecularly simpler and harmless to humans and the environment. The process of when an inorganic semiconductor such as TiO2, is irradiated with ultraviolet light (wavelength 320 and 400 nm). The absorbed energy causes electronic excitation, causing electrons to peel off the outermost atomic orbitals of the semiconductor. These electrons detached in contact with the water and the O2 form oxidizing and reducing regions. Various tarnishes, organic and inorganic, in contact with these regions degrade electronics, dissociating into substances simpler and less offensive, like CO2 and H2O. Researchers from various countries studying composites based TiO2 coating surfaces as diverse as roads, window glazing and surgical scalpels. The photocatalysis is quite an interesting process, and environmentally, for inactivation of resistant nosocomial pathogens, such as fungi and bacteria, since it eliminates the use of chemical antiseptics. Studied in this work, the potential of photocatalysis of a composite base TiO2 encapsulated in epoxy resin, the degradation of Staphylococcus aureus and Escherichia coli, pathogens with high hospital infection, with a view to its application in construction, as floor coverings, walls, ceilings and furniture hospital facilities. The experiments were those with only manufacturing of tablets and lozenges epoxy resin with the composite at various concentrations of TiO2 and/or glass powder. The pads were contaminated with bacteria broth and exposed to sunlight and ambient light (solar indirect and fluorescent lamp) for certain periods. The pellets were washed in sterile saline. Part of this solution was transferred to plates containing Mueller Hinton Agar and incubated for 48 hours. After this time visual count was made of the number of CFUs in the board. The obtained results, mainly at ambient light, indicate the potential ability of the composite fotodegradante. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-11-04 2014-06-03 2016-06-22T18:37:27Z 2016-06-22T18:37:27Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
MARTINS, José Anceloann Lago Grande. Study of photodegradation capacity of a TiO₂-based coating facing the bacterium Staphylococcus aureus. 2013. 80 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Uberlândia, Uberlândia, 2013. https://repositorio.ufu.br/handle/123456789/14199 |
identifier_str_mv |
MARTINS, José Anceloann Lago Grande. Study of photodegradation capacity of a TiO₂-based coating facing the bacterium Staphylococcus aureus. 2013. 80 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Uberlândia, Uberlândia, 2013. |
url |
https://repositorio.ufu.br/handle/123456789/14199 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Uberlândia BR Programa de Pós-graduação em Engenharia Civil Engenharias UFU |
publisher.none.fl_str_mv |
Universidade Federal de Uberlândia BR Programa de Pós-graduação em Engenharia Civil Engenharias UFU |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFU instname:Universidade Federal de Uberlândia (UFU) instacron:UFU |
instname_str |
Universidade Federal de Uberlândia (UFU) |
instacron_str |
UFU |
institution |
UFU |
reponame_str |
Repositório Institucional da UFU |
collection |
Repositório Institucional da UFU |
repository.name.fl_str_mv |
Repositório Institucional da UFU - Universidade Federal de Uberlândia (UFU) |
repository.mail.fl_str_mv |
diinf@dirbi.ufu.br |
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1813711407927001088 |